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Digital control circuit for serial UART transmissions

a control circuit and serial technology, applied in the field of control circuits in television settop boxes, can solve the problems of generating unnecessary interrupts and degrading the performance of the set-top box, and achieve the effect of preventing unnecessary or unwarranted uart interrupts

Inactive Publication Date: 2008-09-09
MAGNOLIA LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In one embodiment, the second circuit is a G-LINK circuit having a bi-directional line coupled to a G-LINK port, and the input / output device is a UART. When the G-LINK port is short-circuited in a particular operational mode, the DCC prevents signal transmissions from the G-LINK circuit to the UART. In another operational mode, the DCC monitors the state of the UART's output and during UART transmission, the DCC sets a high state on the receive line of the UART, indicating no incoming signals and thus preventing unnecessary or unwarranted UART interrupts from being generated by signals coming from the G-LINK circuit. In yet another operation mode, the DCC allows free flow of signals to be transmitted from the G-LINK circuit to the UART. The DCC thus enables the G-LINK signal feedback to the UART when required.

Problems solved by technology

This unnecessary feedback causes the UART 12 to generate unnecessary interrupts to be served by the operating system.
The processing of these unnecessary interrupts may degrade the performance of the set-top box.

Method used

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  • Digital control circuit for serial UART transmissions
  • Digital control circuit for serial UART transmissions
  • Digital control circuit for serial UART transmissions

Examples

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Embodiment Construction

[0015]FIG. 2 illustrates an exemplary circuit arrangement according to the principles of the invention. A G-LINK circuit 10 serves as a serial interface circuit for coupling a conventional universal asynchronous receiver-transmitter (UART) circuit 12, e.g., a portion of a TL811 integrated circuit made by TeraLogic Inc. headquartered in Mountain View Calif., USA, to a G-LINK serial port 14 for a plurality of purposes, e.g., to provide the UART 12 with a signal path and controls for converting from full duplex to half duplex communication to and from G-LINK serial port 14, or to provide a signal path directly from the UART 12 to the G-LINK serial port 14 for full duplex communications, for further design improvements or for troubleshooting purposes. A digital control circuit (DCC) 22 is disposed between an output line (GLNK_Rx 18) of the G-LINK circuit 10 and a receive (input) line (UART_Rx 23) of the UART 12 for controlling the signals transmitted from the G-LINK circuit 10 to the UA...

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PUM

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Abstract

A digital control circuit enables / disables the feedback of serial transmissions of an UART receive signal when the G-LINK output port is short circuited in a particular operational mode. In a conventional operational mode, the digital control circuit monitors the state of the UART's Tx output and during an UART transmission, the Rx line normally is used for statistics feedback to set to a high state and eliminate unnecessary or unwarranted UART interrupts generated by the G-LINK circuit. The digital control circuit thus enables the G-LINK signal feedback to the UART when required, thereby maintaining a functionality to identify the unit's operational mode and allows the serial ports of the G-LINK to be configured and utilized during conventional operational modes.

Description

[0001]This application claims the benefit, under 35 U.S.C. § 365 of International Application PCT / US03 / 10400, filed Apr. 4, 2003, which was published in accordance with PCT Article 21(2) on Oct. 23, 2003 in English and which claims the benefit of U.S. Provisional patent application No. 60 / 371,983, filed Apr. 12, 2002.FIELD OF THE INVENTION[0002]The present invention relates to control circuits in television set-top boxes, and more particularly, to a feedback control circuit.BACKGROUND[0003]In order to achieve high-speed packet transmission, a gigabit rate transmit / receive chip set (transceiver) must be employed. One such transceiver is a device sold by the Hewlett Packard Company headquartered in Palo Alto, Calif., USA, which makes and sells a transmitter designated as the HDMP-1022 transmitter and a receiver designated as the HDMP-1024 receiver. The HDMP-1022 transmitter and HDMP-1024 receiver chip set is described in detail in a 40-page Preliminary Technical Data sheet dated Augus...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G08C19/00H04L29/08G06F13/38H04B1/69H04N5/00
CPCH04N21/42607G06F13/385H04L12/00H04N5/54G06F13/38
Inventor PERDUE, KENNETH LEE
Owner MAGNOLIA LICENSING LLC